Re: [PATCH 2/2] tpm: add backend for mssim

[James Bottomley <jejb@linux.ibm.com>]

On Mon, 2022-12-19 at 06:49 -0500, Stefan Berger wrote:
> 
> 
> On 12/16/22 08:53, James Bottomley wrote:
> 
> > 
> > I could do a blog post, but I really don't think you want this in
> > official documentation because that creates support expectations.
> 
> We get support expectations if we don't mention it as not being
> supported. So, since this driver is not supported the documentation
> for QEMU should state something along the lines of 'this driver is
> for experimental or testing purposes and is otherwise unsupported.'
> That's fair to the user and maintainer.

Open source project don't provide support.  I already added a
Maintainer entry for it, so I'll maintain it.

>  Nevertheless, if the documentation (or as a matter of fact the code)
> was to claim that VM / TPM state migration scenarios, such as VM
> snapshotting, are working then users should be able to ask someone
> 'how' this can be done with the mssim protocol **today**. Since I
> cannot answer that question you may need to find a way for how to
> address this concern.

I already proposed all of this ... you were the one wanting to document
migration.  The current wording is:

   The mssim backend supports snapshotting and migration, but the state
   of the Microsoft Simulator server must be preserved (or the server
   kept running) outside of QEMU for restore to be successful.

James